The worst smog in years hit Southern California and many people go to hospital for respiratory treatment.
San Francisco Bay Area issued the "Spare the Air" alert on Monday, July 25. Learn more about this alert here.
The ozone layer is on its way to complete recovery with the absolute shrinking of its hole by 2050.
After three decades, the ozone hole above the Antarctic starts to heal, according to the scientists.
What effect does ozone have on the environment? Scientists have found that ozone doesn't necessarily promote the decline of natural ecosystems.
Storms and ozone may play a huge role in rainforest cloud creation.
It turns out that common chemical coolants actually lead to ozone depletion.
It turns out that climate change may have contributed to a drop in high-ozone levels. Scientists have found that a stronger sea breeze due to warmer soil temperatures caused this drop in the Houston area.
As temperatures rise on our planet, greenhouse gases are mostly to blame. Now, scientists have taken a closer look and have found that the sun affects middle atmosphere ozone, which may have potential implications on smaller scale to regional climate.
Earth's ozone layer may be on the path to recovery. Scientists have found that the concentrated, international action against ozone depleting substances has put our ozone back on the track to regeneration.
Scientists have examined Earth's atmosphere and have found an unexpectedly large amount of an ozone-depleting compound from an unknown source even though it's been decades since the compound has been banned worldwide.
It turns out that the United States may be having a lot more trouble with ozone pollution in the future. Researchers have found that Americans face the risk of a 70 percent increase in unhealthy summertime ozone levels by 2050 as temperatures continue to rise.